eclipse - java.lang.UnsupportedClassVersionError: org/openbravo/base/ConnectionProviderContextListener : Unsupported major.minor version 52.0 -

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I am using eclipse indigo running on Ubuntu and I want to install a tomcat server after the last part of this guide. I'm trying to:

My problem is that when I try to boot the Tomcat server, I get this error (on the local host server tomcat v6 .0 The server fails to start.):

Enter the image details here T

I console looks like this: 

  because: java.lang.UnsupportedClassVersionError: org / Openbravo / base / ConnectionProviderContextListener: unsupported MAJOR.MINOR version 52.0 (no puedo Cargar clase org.openbravo.base.ConnectionProviderContextListener) at org.apache.catalina.loader. WebappClassLoader.findClassInternal (WebappClassLoader.java:2822) org on org.apache.catalina.loader.WebappClassLoader.findClass (WebappClassLoader.java:1159) on org.apache.catalina.loader.WebappClassLoader.loadClass (WebappClassLoader.java:1647) .apache.catalina Loader.WebappClassLoader.loadClass (WebappClassLoader.java1526) at org.apache.catalina.startup.WebAnnationSet.loadClassAnnotation (WebAnnotationSet.java:145) at org.apache.catalina.startup.WebAnnationSet.loadApplicationListenerAnnotations (WebAnotationSet.Java: 73) At org Org.apache at org.apache.catalina.startup.ContextConfig.start at .apache.catalina.startup.WebAnnationSet.loadApplicationAnnotations (WebAnnotationSet.java:56) at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig (ContextConfig.java297) on .catalina.util.LifecycleSupport.fireLifecycleEvent (LifecycleSupport.java:142) on org.apache.catalina.startup.ContextConfig.lifecycleEvent (ContextConfig.java:261) (ContextConfig.java:1078) on org.apache. catalina.core.StandardContext.start (StandardContext.java:4611) org.apache.catalina.core.ContainerBase.start (ContainerBase.java:1053) on org.apache.catalina.core.StandardHost.start (on StandardHost.java: 840) lina.core.ContainerBase.start on org.apache.cata (ContainerBase.java:1053) org.apache.catalina.core.StandardEngine.start (StandardEngine.java:463) org.apache.catalina.core.StandardService. At start (StandardService.java: 525) org.apache.catalina.core.StandardServer.start (StandardServer.java:754) org.apache.catalina.startup.Catalina.start (Catalina.java lesson9) ... 6 more   
 What can I do? I tried to add Tomcat-Julie to my server classpath, which I found is the main solution, but it does not work. 
 
 Thanks in advance. 
 
 
 Edit: 
 
 Thanks for the answer Tomcat starts but the resource does not provide. Openbravo projects also have compilation errors. 
 
  Eclipse Openrobao project 
 
  
  Bad configuration in eclipse 
 
 
 Edit second: 
 
  
 
 Tree deployment 
 
 
 
 
 update your JDK version 
 
 edit Maybe it's JDK / Jeari 8.

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